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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7551da47b533c5cec4a2e7a5ef95cd4c6e9ef3eae104a04f2c69ab0a6066cce3' 
  AND token = 'yBGS/+hg+HofFZaEyOPv8UNespOlLcLImIR3N8/DrQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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