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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a530f09a728e185c1b4e08fb51bc2191d1a437bb0f3633cf672021ec4f408e' 
  AND token = 'Os2vlIAGk+oCPTHfyeC5SHb2iezWBFdt3cWvbooYUPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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