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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ebbeca78b1af4a3f82f4bc3b505b8ab9ec9519c6f38225ea75c12bf5c57f48' 
  AND token = 'xvoUK5TyK/q0VEgxkgj6ROWMDmyVJoE6K14VHs0fCCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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