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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff519a6098a2361f89fe063bb31529b2f04e3584b5ebb440f2f5372c6937796a' 
  AND token = '1G3Bv0aAOy0vE4P2kW6duuDex5ARJh4y1Bw8CPw6up8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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