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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7931cd90c260469367a81ce4a0111c81b791d16997dcf3738dce11c16faf4bc6' 
  AND token = 'DMz5uOJ/TQ4CzutEnKnxzVRZoUBXGeXt/NKRGoOWphA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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