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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f33999062145b3c215f2975a9f788aa41fc3176425bc9ccb2158b379318c46' 
  AND token = '4PMRESpSWNGVbBn0oMadsDT8fj6JGSuHkwSyYESRZ/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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