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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700d5f9ca9df0f1b3f6f46917e5e2582204c13b56084b4c1f034e0498166e1c6' 
  AND token = 'S2wcX0Tk6591zg0Lwf/IR2OYtZ1+lISvOmM5cicHBBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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