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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d2aa75e56fa690823272d42375a1487f5f8bc35d5259222187780e8cda95bc' 
  AND token = '7Xyv3DYVdcM4C+KQfKHzcUu/CEfnfpiHFJKb/xS264w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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