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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f6b2cd60a8a1a74b1db5cd6618b2d05987b1660993ad99d663b14f2479a7b6' 
  AND token = 'v3mNYGHwb/ku4o1GQmzdmzocGd2c1YDtwgCUcyEP7iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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