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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773b78aed4f03041a2ce2036ee23b052cdd0b760cd0698e28217c1bf38208bde' 
  AND token = 'fGUSh48R0nhc5TKXWQUW4JWjBfNrKVh8MhSyX0LPQN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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