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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27451ec7e5fe9104e3f3dd4914f9d268a5f7932f16b03cb1ffea9efae682209b' 
  AND token = 'UYoDgMrUIUYdo8BWoxtaV051btfQc44Nmp6MUYQwE8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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