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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca81f5ad5599e57db6d3da364f948397b4a2098cd3cf40df8cab6700e1c1c60' 
  AND token = '/l4vxCavZz9pQyRE09GOJp4Xi1p4bGeuXmKr75ZT/jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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