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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0427c9874ab1d97962fc9fc99c3dbb378a4277f04834d0ca8d7f9d5b568231c' 
  AND token = '4fB5A8VLimg1zo3MPxT8BG+Tdi48wLR1josGWyrb51k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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