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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59c8c8bd10e5187bdf84e65a7d30e502b38567e22955f65cd12a99f1054ab69' 
  AND token = 'h8uhjHSylAleqOc0p4iBugvog10UG3typ028ZcqqS3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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