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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a190767fcd18bab0b6b1afd69b8f641803c8bd43b53fc492e6e2ec8fece5da' 
  AND token = 'LlawOmSn50MVtyPAoqh99DUDYUDrdGqO24O0Rq4KjWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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