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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9075f6c23c894bd2647f1568f4f20fda093b1c0390db5e935edb8fb47dafb3' 
  AND token = '49+FTReg+yyX+m2ccmvkADJSNXMKiw05m704l4qsCt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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