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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0996ff6df4ba38653ae1b72e011ddc0f05d3b4daec03d5c8e683eec86f4fc041' 
  AND token = 'T3OWFb35TYTM3P2hDUoqyUPv/G/DmC0ntRNdzFjDg2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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