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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706c562fc85d4436a48d83ecde32045eeb8fbb0114936c4f89629b06b4fdcc4d' 
  AND token = 'SZ3rKBkM1IpUrfAsMmQuZ5f8ASFpERnkaBoUqcGttMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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