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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4f1c2b5a18fcf8ab1fc2b0cae039cf5b53819527284db117033f9ac4b7acd9' 
  AND token = 'eN1uS+BLBmdG03Q9LH56LFdUX+TWp693cCHHjlJp0fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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