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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9627a88f08f6fb888a8f87752b666c5e02aa3af0981219906ec6e905d430fe' 
  AND token = 'RUDY4UO1FCLGiGcu0MFXFXfqUmOBFiMr7dslJyEoVy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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