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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f3c6ed8fe28de6c9a20fb07a2e6b5665d2873803a31dcbabdaec2d98d07bb2' 
  AND token = 'mhUsHf6Rbv2LZyaqFXGLL6CpXxbibaYt38+JJmLiMBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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