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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b75a5309dc2c23eed571f7929030469b6b33abefbe45155bb084c2326e5ae8' 
  AND token = '8Tekn6lvoIxIF3Aq7BIdCoqbL4ov6S211cxN0dXYyB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}