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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c90a9ee620386d6db0a1daef3dd8ac5da703a0e648ca0efe138817234c5f3e' 
  AND token = '/KlfDMA67RzUa8zhNIJeiUujxx16QlBp/LLtLozsPm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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