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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d07e3ca2ff55994c519cd18685a142caabd273adde0cf148982a4b55f9886f4' 
  AND token = 'C7kBV+LoK8AEl+bBGa3SZ/X2BOINJlM4AFcucMdq7IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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