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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b69f479fc8946eb1497020020d3931270242cc09d660eae21c32588b5b132d2' 
  AND token = '1oA23XnIyCnLLW+20DdGG2RirAV1IndVYZsGnIWk4kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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