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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c336b7cc658d1108d6f4dc6014864180a801a57cbe0b3fbc3fb3e248cdd477dd' 
  AND token = 'b1sP2JHXn4zsmQY0ryGrEqrcVj3aR5kJHTLA+Hy8e+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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