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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd2a6cb28b332be68d216b84a84fc5a78718640c949e2c2cd4cc322555c58a5' 
  AND token = 'AVhDA7dOqoGlkWX7fCcKQyODTn6+9s4Y40WaBhZQrr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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