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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a34a031818eea2bd358fd074732802749b25e55cf8d52daf4de568b4589ab5' 
  AND token = 'XAVy60fpLz80PhT/9TmUFX8KXYz7rtUNZW3+LXovmbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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