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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f7f863aee9f4a1bca1b4a4ec327bb0faf4b7b0997c20c26194a76894322e5a' 
  AND token = '+HfeXFRM77BGsB5PsbAK4MKqbogmYUPDVFdV7V54014=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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