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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1b4570899fe0bf5242edf0adc8c28119e53596b4e0928535056e4e2c7e2c02' 
  AND token = 'QC84NSWbkdVYPcnWhTdZWnuYBYSiIOJ42wjJQeYLLP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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