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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8cea5d64ecd7228fd144abcfec8723c276b2e7d4102a676e27891ba8b0f011' 
  AND token = 'na/q+L3u7RKWtULSH+FK3XvtIL5ilh6CU97TBQbT4Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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