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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c31d1ee396f366a7086c14e24af8059e1c1ed440b8f5122cfd07d54cff98fc' 
  AND token = '7fuO3SMp/QvIDKbZxuXL314P+P3oqs4FnemvfzKf4Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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