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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c066793c4d9f81173babef362a8ae3110ef9a5a3a145a64b6a6f9308fda3d3cd' 
  AND token = 'kIqJJ7AJ3W9a1sG+LGA1I+lG5ISuap+Qpy7BOFNpv2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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