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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f704f8c33b616b13a3f798a663126ae2e64586d775ff9b69dcc77cfeca330ca9' 
  AND token = 'gFMOMLWg3Cl77KXjQze8MNyEI6JCM/YeWcJvV4eH+fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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