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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087fd06d0a19abcdd940bf4546a01d67514a31756d40f9aa800942e868f1ed0b' 
  AND token = '3B4R1mvgDk0XlE2fQr2/TUx/dqQELD3I0ZrBq/A33qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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