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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf88fa083a0a27acbfdf29380c8df63a92abc3949a46185c49be6a8905174b5' 
  AND token = '9XJujMShHrtYxs6JVhb8NEfuKRfb+p2/IoIFFDiAekM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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