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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40bd6a527fe0b9ca3c13f94f5715006892906b5e3bbaf0a66e217b3a14e8f1c' 
  AND token = 'BzMolSVn/FazbhB/A9c3RASEqcpeqbmG+p4cV67F6WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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