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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8bb2dd9ad4b419dce3da53edde063237d3fe43eb0b50a0c8dc6ee734f1dd8d' 
  AND token = 'YIcz2FMuYJ0cuOVoBBD8yb/GkWTd/Rw7+f2+lC+z044=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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