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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945958a30a2d54fe3a34dfb05636b1d859720d6035292eb87e8eece082e8f0d9' 
  AND token = 'S7tRGpy6F14Y62W9AxvsemNIUM67LVSl5pkXu0n9GSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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