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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a97c9939cd6be480a0e2e857522088a1c073340acadb67d2c7e150ee967467' 
  AND token = 'WpVYgZB+r4md22PkW4AWfkr9oiWz2DrwyJPlRFI8+pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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