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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fab92ffeedf1a3d0cadd6a4290ae79344069c4b1e1f26d6a0a723da3ac8416' 
  AND token = '9EbUPyiYtlacIsgTh7Gj8t+o/H7p9u3YLqGFvA/LUAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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