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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8628c802901099adce4c16ef1823ce5f38e2c6fc5ef95003e0a0f00c850d349' 
  AND token = 'jm8L2rqigb1XkyUZkp3PkmPAPMxd626QLedSHLoXH+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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