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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ba09fb55936e5d736e38a4eec6f9532b55f43ae22d85f8dcedb6591e2d0cd4' 
  AND token = '77a1f8u4nIesb3kE1guCBCX3FT/pHA7bo2xCrhwBGvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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