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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae2f2146777662642a01b2a73c1f0be8d71d3aac7c5c89d1793f978d314b26d' 
  AND token = 'ViGm+ieS0uOtd/Rhh3fgrLyA9SdmXfligSUYQ06FyXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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