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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844d98c887f99b5a6041ef15bf5b1b5072226074d113936b4d2a050937e06e93' 
  AND token = 'SjDAcQJg73fJ3uf3obofrFNZKD3aM8ZCXdtUHLhc3kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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