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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1004f35a5e26093c2a3b6c8390c0c9eda56af492b45d324986c11d922ceb74' 
  AND token = 'FZpDURkxtv4ULDe6wfYBwzkxQwJamvZJjRWjqbo6kbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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