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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3705940f98c182bda053ebe0bcf5f2cfa50f2b06c3a8d572cb927c5f8d3699ee' 
  AND token = 'gj2wWPRj3Gkc9rkaf+8pfu1KzLCBGTnuhi5ocXEDtH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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