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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58f50cc10bc8d5cfc6b4f68e3314049609bc81c5a414c2c6d69ca7926c0ecfc' 
  AND token = 'BfZ/Q6mcbHtGtfPD1wVXyQ3KGXCqUhUfM3tIyGRfUP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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