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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bcabf5bd5ebf1fc1597851f7ef4e0d2c5744ee8f11253d7e0b9283e8d94c39' 
  AND token = 'EIPQphRTCA+0iIqJdMTO9Bcxt9/Kbfyry0Y5ZYepJko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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