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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8d96e37f5a0d16f9aece456cc997242a58fe94d77374055606cac92fd435ce' 
  AND token = 'f6A5WBpTRfW4FFJxOtBiVOp160Ia9UxuwQGleJtzIB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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