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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5c880cfb06c7a27c0164fc4f1d62ca6aa98a74e2bbe83b2337ae8e55fa3511' 
  AND token = '8E6GL4C/RPB27u2Tbze580YY3h82OAebEPLLqk8A2A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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