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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ed6043610951b248ee9f024c3e595fb946c903ba16de5e13322be67f208318' 
  AND token = '6ZCWLZ2nb5jCMwnRPQ2Yl/1VMEs033S1NbPv3AogVho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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