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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe17af4e623d2a72329dfef551b2ec06dfa8333cab2201b43dbd803687d47e69' 
  AND token = 'ls2lUkFkgaAra3WAWDq6OqT3taa+BtjZNnSIJdizWLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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