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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531e265590b12b5de8416141a0936b5af35965ad5af85d1926bd08d469ad68a4' 
  AND token = 'z4r4Gqk0hyhaYTEFZEm61ZEismcq/YKDyyOA3iJFRnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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