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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da86a0aaa895b456309ff391cf26ef41bc521545b357caf6324f6438875c9acd' 
  AND token = 'F4TElyGmqWn8J8ZCVbaTfnuACYokUR1XL3+OceEzsCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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