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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4c543e99b7846d7920d4e0a533dbb466d0eb898cafca01ced79d1164a5d2f3' 
  AND token = 'inVVmYu4zin3pmfhnXhohzVtTSRLpscxNOOBcyLR3/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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