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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedcbbe6dc6db519a2780c03dc136f4006e5c88eceb753841ad69d161e616890' 
  AND token = 'zR3v/M27YX4y6N3yf1kLnm7RZObrN60u4NOSbkh8M+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00252

JSON explain

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